Gyratory crushing-mill



W. W. GIBSON.

GYRATURY CRUSHING MILL.

APPLICATION mm 58.18, 191B.

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Patented June 22, 1920.

2 SHEETS-SHEET I.

/NVENT W- W. EIBSN v Arr'Y W. W. GIBSON.

GYRATORY CRUSHING MILL.

APPLICATION man rss. la, ma.

1,344,584. Patented June 22, 1920.

2 SHEETS-SHEET 2. ,ff/ Ffa z Y ka/...5a.

'WILLIAM W. GIBSQN, 0F SAN FRANCISCO, GALIFORNIA..

GYBATOBY CBUSHING-MILL.

Specification of Letters Patent.

Patented June 22`,192o.

Application led February 18` 1915. Serial No. 217,750.

To all whom t may concern.'

Be it known that I, WILLIAM W. GIBSON, a Canadian subject of the King of Great Britain, residin at San Francisco, county of San rancisco and State of California, have invented new and useful Improvements in Gyratory Crushing-Mills, of which the following is a specification.

The present invention relates to improvements 1n crushing and pulverizing mills. The object of the invention is to rovide such a mill, which, while substantlal and durable in construction, will be very eiiicient in proportion to its weight, and therefore can ea'sil be transported into inaccessible mining diistricts, and which can also be quickly set up.

In the accompanying drawing, Figure 1 is a side view of the mill; Fig. 2 is a vertical section of a lowerA portion thereof; Fig. 3 is a plan view of a collar; Fig. 4 is a broken plan view of a die.

Referring to the drawing, 1 indicates a suitable foundation, upon whichvare supported columns 2, connected at the top to guy wires 3 and to a cross-head or frame 4. Said frame carries upper and lower vertically extending bearings 5 in which can rotate a vertical shaft 6. To the upper end of said shaft 6 is secured a bevel gear 7, which meshes with a bevel pinion 8 on a horizontal shaft 9 rotating in bearings 11 carried by upward extensions 12 from the frame 4, by which power can be transmitted at will to said shaft 9 to rotate the shaft 5.

On the lower portion of said shaft 6, below the frame 4, is secured a crank arm 16 having at its outer end a lobular socket 17. An arm 18 integral, an in line, with said arm 16 extends on the opposite side of said shaft 6, and carries a counter-balance weight 19. In the socket 17, which is made with a removable section 21, is contained the globular upper end 22 of a short stem 23, which extends upwardly from the top of a slightly conical hollow arm 24, in a lower portion 26 of which is an opening closed by a door 27, and permitting access to parts which require lower portion has at its lower end a flange 28 bolted to a ange 29 at the upper end of a. tubular muller 31. By the rotary motion of said shaft 6, transmitted through the crank arm 16, a gyrating motion is imparted to said muller. Said muller comprises, in one piece,'a wide lower cylindrical portion in the adjusting or oiling. Said.

32 secured at its lowerv end to an annular shoe 33, a conical intermediate portion 34 having aperture 36 therethrough, a comparatively narrow cylindrical portion 37 carrying at its upper end the flange 29, an annular portion 38 extending inwardly from the juncture of the conical and cylindrical portions 36 and 37, a horizontal circular series of vertically extending webs 39 connecting said portions 3S and 37, and a circular` flan e 41 extending outwardly from the top o said cylindrical portion 32 and to which is secured by screws 42 the lower end of a hopper 43.

In a seat in the portion 38 is seated a thrust roller bearing comprising a ring 44 supporting a ring 46, which sup orts a circular series of rollers preferably in the form of balls 47, which in turn support a ring 48, all of said rings 44, 46, 47, surrounding a vertically extending tension rod or bolt 49 having at its upper end a nut 51 bearing against the upper flanged end of' a thimble 52 around the bolt, the flange of which thimble hears a ainst the upper surface of said ring 48. 'he lower end of said bolt 49 carries a nut 53,which in turn earries an apertured hemispherical bearing piece 54, which is received in a correspondingly sha ed socket 56 in an annular spring support 5 loosely surrounding the bolt and having an annular channel 58 on its upper side, in which is contained the lower end of a spring 59 coiled around the bolt. The upper end of said spring bears against an annular shoulder 61 of a tubular housing 62, a lower portion of which rests upon the foundation 1, and supports an annular die 63. The annular shoe 33 secured to the muller is thus pressed a ainst said die by the pressure of the coile s ring 59. The crus ing pressure, that is, t e pressure of the spring, can be varied by turning the nut 51, thus raising or lowering the bolt, and diminishing or increasing the length of the spring 59. It is to be observed that the pressure of the spring is increased when there is an increase in the thickness of ore or other material between the shoe and the die, because such increase raises the muller and the thrust bearing and shortens the spring. The inner surface of said shoe 33 is corrugated as shown at 64. A portion of said die reduced in thickness supports a cruslr ing cone 66 surrounding the housing and formed with a horizontal series of upwardlv extending ribs 67 of which the lower ends are integrali f connected to a ring 68 resting on said t ie and the upper ends are connected to a rin G9, both of said rings surrounding said housing. Said housing has an upwardly extending slightly conical or flaring portion 71 to prevent ore coming in contact with the bolt 49. Said portion 7l has an annular horizontal rib 72 with a conical lower surface, between which and a conical upper end of the crushing cone 66 is a collar 73 in two halves, (Fig. secured together by bolts 74 and nuts 76 through lugs 77 o positely extending from said two halves. 'ghe collar has upper and lower surfaces which converge inwardly toward the seat so that, when the two halves of the collar are drawn together by the bolts and nuts, said collar, by its wedging action between the rib 72 and the cone 66 presses said cone firmly downward 'upon said die and holds the cone and die very securely in place. To said cylindrical portion 32 of the muller is secured, by bolts 78, a lining 79 having horizontally extendin circular ribs or corrugations 8l. A cylin rical wall 82 formed integral with the housing surrounds the shoe and die, and on its top is secured a cylindrical screen 83. From the outer side of said wall extends a launder 84 down which the pulp flows, discharging at its lowest point throu h an opening formed in its outer wall. upported upon said outer wall is a metal wall 86, the purpose of which is to prevent any of the pulp splashing outside said launder.

Between the inner edge of the die and the housing there is formed an annular chamber 87 in which is placed amalgam to catch the particles of precious metal received in said chamber. The die also has passages 88, preferably eight in number, spaced at equal intervals, leading therethrough to its outer wall, which outer wall is spaced from the wall 79 to form an annular chamber 89 in which chamber is received amalgam to catch the gold dropping through said passages.

The shaft 6 is rotated at a speed of about 200 revolutions a minute, and, owing to centrifugal force, the muller has a speed of rotation, independent of its speed of revolution with the crank shaft, of about 60 revolutions a minute. The spinning motion thus given to the muller and shoe attached thereto, together with its sliding motion, has a very beneficial effect in crushing and pulverizing the ore.

It also acts very effectively to brighten tarnished or rusty gold. Y

It will be observed that the exterior surface a of the muller on one side, here shown as the left, and its interior surface b on the other side, here shown the right, are spaced from adjacent upwardly extending portions c, d, of the die a considerable distance, so that, as the muller gyrates rap-- idly, it can strike any hard object intervening between said portions of the muller and die a powerful blow tending to break said object. Thus my mill is adapted not only to grind but-also to break by impact hard obects fed thereto.

am aware that it is not new to use compressed springs to exert a pressure be- '15 tween a gyratinff muller and a die to avoid the necessity o using heavy weights for obtaining the needed crushing pressure, but heretofore such springs have been used in locations necessitating the employment of i standards or other parts of considerable length and therefore requiring to be of great strength in order to withstand the crushing strength of said springs. In my invention it will be observed that the force of the spring is exerted at one end upon the shoulder of the housing and is resisted by the tensile strength of the bolt. Elements, such as a bolt and a tubular housing which have to resist tension only, can be made 90 much lighter than if they were required to resist the same force applied in a bending or crushing direction. Moreover, in my present invention, the arrangement is such that the parts between which the spring pressure acts are very close together, so that the elements, the tensile strength of which resists the spring pressure, do not have to have great length and therefore may be made comparatively light. I believe that I am the first to use a tie or tension rod to trans mit the force of a compressed spring to a;

-gyrating'muller to press it toward a ie.

The roller bearing, comprising the balls 47, by which the pressure of the spring 59 105 is transmitted to the muller, is an improved feature of the invention for two reasons first, in that it permits the mullcr to rotate on its own axis and independently of its gyratory motion, which rotation is caused by centrifugal force, while pressure is imparted to the muller by a spring; and, second, it provides a connection between the tension rod 49 and the muller which is slightly cxible, permitting the muller to swing slightly to one side independently of its gyratory motion. Both of these movements of the muller assist in increasing the crushing effect of the ore.

1. In a gyratory crushing mill, the combination of a die, a muller, means for gyrating said muller, a spring for pressing the muller toward the die, a centrally located tension device for receiving said pressure from said spring, and rollers for receiving said pressure from said device and transmitting it to said muller.

2. In a gyratory crushing mill, the conibination of a die, a muller, said die and i portion, a muller, said muller havin cooperating substantially horizontal sur aces, means for gyrating said muller, a coiled spring for pressing the muller toward the die, a tension device for receiving said pressure from said spring, and rollers for receiving said pressure from said device and transmitting it to said muller.

3. In a gyratory crushing mill, the combination of a die havin a central tubular ie and muller having cooperating substantially,r horizontal surfaces, means for gyrating said muller, elastic means for pressing the muller to- Ward the die, a tension rod extending through said tubular ortion for receiving said pressure from said means, and rollers receiving said pressure from said tension rod and transmitting it to said muller.

4. In a ratory crushing mill, the combination oir a die having a central tubular portion, a muller, said die and muller having cooperating substantially horizontal surfaces, means for gyrating said muller, elastic means for pressing the muller toward the die, a tension rod extending through said tubular portion for receiving said pressure from said means, and balls receiving said pressure from said tension rod and transmitting it to said muller.

5. In a gyrator crushing mill, the combination of a housing, a die supported thereon, a compressed spring one end of which bears a ainst the housing, a tension rod, a rounde bearing piece carried by its lower end, a socketed spring-supporter. in which said rounded bearing piece is contained, the other end of the spring being supported by said supporter, ball bearings supporting the upper end of said tension rod, a gyratory muller supporting said ball bearings, means for gyrating said muller, and a shoe carried by said muller and coacting with the die.

W. W. GIBSON. 

